William bright



(No Model.)

W. BRIGHT. GRINDING MACHINE FOR METALS.

No. 499,706. PatentedJune 20, 1893.

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' ilarrnn STATES ATENT FFIQEQ \VILLIAM BRIGHT, OF SHEFFIELD, ENGLAND.

GRINDING-MACHINE FOR METALS.

SPECIFICATION forming part of Letters Patent No. 499,706, dated June 20, 1893.

Application filed November 12, 1892. Serial No. 451,810. (No model.) Patented in England November 3, 1539, in

Germany September 2, 1890, No. 55,598, and in France September 6, 1890, No. 208,082.

To all whom it may concern.-

Be it known that I, WILLIAM BRIGHT, a subject of the Queen of Great Britain, and a resident of Sheffield,in the county of York, England, have invented certain new and useful Improvements in Grinding-Machines for Metals, (for which I have obtained patents in Great Britain, No. 17,791, dated November 8, 1889;in Germany, No. 55,598, dated September 2, 1890, and in France, No. 208,082, dated September 6, 1890;) and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to improvements in machines for grinding metal articles such as files, machine knives, and other like articles having either a fiat or a curved surface; and the objects of myinvention are to make a machine with easier access to the work under operation; to keep the water and suspended grit constantly in motion; and to simplify the method of holding the work.

An improved grinding machine made according to my invention is shown in the annexed drawings, in which-- Figure 1 is a side elevation of a complete machine. Fig. 2 is a plan of the machine, with the upper parts of the standards, the stone and the hacker removed; Fig. 3 a fragmentary end view showing the arms for moving the strap forks of the reversing motion; and Fig. 4 a fragmentary end View, showing the handles of the reversing motion.

Similar figures of reference indicate similar parts in the Various views.

The improved machine, briefly described, has a pair of standards on the faces of which is mounted asaddle, adjustable vertically and carrying the stone, while underneath the stone is a horizontally moving trough which carries in a peculiar manner the work or articles to be ground.

The standards 1 are erected upon a suitable base plate or plates 2, and upon their front faces, which are machined for the purpose, a saddle 3 is fitted, with suitable journals to receive and carry the grindstone-axle 4, and the grindstone 5. The driving pulley is fixed on one end of the axle and a loose cam 6, for giving a lateral reciprocating motion to the axle and stone, is fixed upon the other. The saddle 3, with its attached parts, can be raised and lowered by means of a screw 7, secured to the top of the saddle, and passing through a screwthreaded worm-wheel 8 on the standards. This is driven by a Worm operated by a radial wheel 9, or, in the largersizes of machines, by means of a loop-chain connecting the worm-shaft with a hand-wheel brought down to a more convenient position upon the standard. I do not claim any of the foregoing as my invention.

The stone 5 can be kept true in its diameter and flat upon its periphery by any approved means. The device represented is a circular hacker 10, which, together with its pedestals 11, slides 12, rack 13, pinion 14, clip 15, power-wheel 16, pinion 17, and handwheel 18, forms no part of the present invention, and need not therefore be particularly described.

Instead of a stationary trough and a movable table upon which the articles to be ground are placed, or a table without a trough, the supply of water required for grinding being given through a pipe, I construct a trough 19 to carry the required supply of water, so arranged that it can be moved to and fro horizontally underneath the stone 5.

The trough is supported upon a pair of wheels or rollers 20, fixed centrally underneath the axle 4 of the stone 5, and is caused to travel horizontally backward and forward by means of a screw 21, fixed to the end of the trough, and passing. through the correspondingly screw threaded hub of. a bevel-Wheel 22, gearing into a second bevel-wheel 23, fixed on the shaft of the driving pulley 24:. Underneath and in line with the screw 21, I fix to the end of the water-trough a supporting shaft 25, which passes through a long bearing 26, attached to a swing-bracket 27 The function of said shaft 25 is to relieve the screw from the weight of the trough, and from other strains when the machine is at work. The bracket 27 is made to swing so as to accommodate'itself to the rise and fall of the trough when curved or irregular surfaces are being ground.

The reversing mechanism by which the reciprocating motion of the water-trough is obtained and thelength and position of thetravel are controlled may for the purposes of the pres ent invention be of anyapproved description. In the drawings such reversing mechanism is represented by said driving pulley 24 and a pair of loose pulleys 28 and 29, on the driving shaft; a slide 30, sliding arms 31, carrying strap forks 32 and 33, and balanced by weights 34 and 35; a tubular shaft 36, supported by brackets 37, 38, and a shaft 39 inside said tubular shaft 36; curved arms 40 and 41, Figs. 1, 2 and 3, on the pulley ends of said shafts 36 and 39 respectively, provided with slots through which the rods 34 35 Fig. 3, of the balance-weights 34 and 35 are passed and by which they are moved from side to side; handles or levers 42 and 43, Figs. 1, 2 and 4, on the front ends of said shafts 35 and 36, the one marked 42 being provided with a segmental block 44 having a notch or recess in its face, while the other, marked 43, has a sliding weight 45, with a projecting stud matching said notch or recess; two adjustable fingers 46 and 47, fixed upon the shaft 36, and a projecting arm 48,0n the side of the trough, carrying upper and lower striking plates 49 and 50, against which the beforementioned fingers strike. As this mechanism forms no part of the present invention further description thereof herein is omitted.

Templet bars 51 are fixed on each side of the trough 19, and rest upon the rollers 20; these bars are straight or shaped to match the form of the article required to be ground, and they raise or lower the trough and the articles under operation as the trough is drawn over the rollers. I do not claim the use of such templet bars as this is not new. The trough is provided with a projecting rib 52 on each side, upon which crossbars 53 are secured to support trays 54 of various sizes; and these trays, when intended to hold files and such like articles, have two or more elastic beds 55 on which the articles are laid. They are hollowed bars, fitted with a block of rubber or other elastic substance projecting above the face of the bar; and the tangs of the files or ends of other like articles, pass under the top overhanging edge of a stop-piece 56, which, without any further fastening, holds the articles in position while being ground, the stone running in the direction of the arrow.

Water is supplied to the trough until it covers the articles to be ground, or it may be raised to that height by immersing a suitable displacer which can-be removed when it is desired to examine the'work.

I am aware of agrinding machine described in the specification of Patent No. 451,192, granted to David Ashton, in which standards with inclined faces are fixed upon the top edges of a stationary trough, into which a sliding table is moved on adownwardly inclining track, so as to pass the articlesupon it under the stone, and I disclaim any right to such arrangement of mechanism broadly considered.

NVhat- I claim, and desire to secure by Letters Patent, is-

1. In combination with a grindstone and mechanism for rotating the same, a movable water-trough provided with a work-holding tray, and supported under the stone upon rollers, and means for reciprocating the trough to move the work in contact with the grinding point of the periphery of the stone, and to keep the water and suspended grit contained in the trough in motion, substantially as described and shown.

2. In a grinding machine, a tray or plate 54,

for holding the work, having a stop piece 56,

with overhanging top edge, to receive the IVILLIAM BRIGHT.

IVitnesses:

ROBT. F. DRURY, B. E. DRURY. 

